How is this a heartwarmining moment?

[ggg-2 3,555]

I saw this on the TVTropes MLP heartwarming page: "An easy blink-and-you-miss-it shot of Applejack on her big brother's back to put up the last of the decorations before the reunion begins." i'm not saying I disagree with it, it's just...I don't understand how it's supposed to be heartwarming.

[Guest90210 3,569]

Maybe it's just the idea of such having a family that is is very close to each other - that they share a such a bond that they will go out of their way to make sure that their most recent get-together is special

[Justin_Case001 4,933]

Is this in "Apple Family Reunion"?  Hmm.  I must have blinked.  Now I want to go watch it again.  I'm not sure if I'd use the word "heartwarming," as much as "endearing."  There's a difference, I think.  This is endearing.  RD and Scoolaloo's hug in Sleepless is heartwarming.